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Antivirus & system state


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#1 nCharge

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Posted 24 October 2012 - 09:34 AM

Hello , it is not uncommon to see that we have to install an AV software after being ensured that the system is not infected (even some software will launch a quick scan before installation).
My question is why ? What if we install AV programs in an infected computer ?

Edited by nCharge, 24 October 2012 - 09:35 AM.


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#2 quietman7

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Posted 25 October 2012 - 09:21 AM

Anti-virus software is a tool for prevention of malware infection. Since no anti-virus is 100% foolproof, even a computer with an an existing anti-virus can become infected. The same is true if there is no anti-virus installed. Once installed it may or may not detect an infection if one is present but it is better than leaving your computer unprotected.

There is no requirement for the system to be absolutely clean before installing an anti-virus as you can install one on an infected computer. However, there are some malware infections which may interfere or prevent successful installation. Depending on the malware infection, there are specialized malware detection/removal tools which can be used prior to installation. Many anti-virus vendors also offer free LiveCD/Rescue CD utilities that are used to boot from in order to repair unbootable or damaged systems, rescue data, and scan the system for malware infections. In some cases this may be necessary first in order to stabilize the system and allow for successful installation.

If installation is successful, than a full scan should be completed immediately. If you cannot install the anti-virus, you can always perform a series of online scans first.
Eset Online Anti-virus Scanner is one of the more effective ones.

Keep in mind that an anti-virus program is not enough because it alone does not provide comprehensive protection. Please read Supplementing your Anti-Virus Program with Anti-Malware Tools which explains why.
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#3 nCharge

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Posted 25 October 2012 - 03:47 PM

Thanks for the additional info ,

interfere or prevent successful installation.

So it is just a matter of just being able to install the AV or not ?

I thought : If we install an AV on a non-clean PC , we could have a proper installation but malwares that were already present will easily "escape" detection as they had "control" before having a protection ?!
(Is that true ?)

Edited by nCharge, 25 October 2012 - 03:48 PM.


#4 quietman7

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Posted 25 October 2012 - 06:04 PM

Not necessarily...if the anti-virus detects the malware during the first scan after you update the definitions, it may be able to remove it.
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#5 nCharge

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Posted 26 October 2012 - 07:19 AM

It is to say that installing an AV after an infection is like running MBAM ?
The infection is not blocked by a real time scanner but will be detected after running a classic scan ?
It's not something like present malware which are going to bypass further scan by manipulating the AV rather that just blocking the installation ?




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